// Common/StdInStream.cpp

#include "StdAfx.h"

#include <tchar.h>
#include "StdInStream.h"

static const char kIllegalChar = '\0';
static const char kNewLineChar = '\n';

static const char *kEOFMessage = "Unexpected end of input stream";
static const char *kReadErrorMessage  ="Error reading input stream"; 
static const char *kIllegalCharMessage = "Illegal character in input stream";

static LPCTSTR kFileOpenMode = TEXT("r");

CStdInStream g_StdIn(stdin);

bool CStdInStream::Open(LPCTSTR fileName)
{
  Close();
  _stream = _tfopen(fileName, kFileOpenMode);
  _streamIsOpen = (_stream != 0);
  return _streamIsOpen;
}

bool CStdInStream::Close()
{
  if(!_streamIsOpen)
    return true;
  _streamIsOpen = (fclose(_stream) != 0);
  return !_streamIsOpen;
}

CStdInStream::~CStdInStream()
{
  Close();
}

AString CStdInStream::ScanStringUntilNewLine()
{
  AString s;
  while(true)
  {
    int intChar = GetChar();
    if(intChar == EOF)
      throw kEOFMessage;
    char c = char(intChar);
    if (c == kIllegalChar)
      throw kIllegalCharMessage;
    if(c == kNewLineChar)
      return s;
    s += c;
  }
}

void CStdInStream::ReadToString(AString &resultString)
{
  resultString.Empty();
  int c;
  while((c = GetChar()) != EOF)
    resultString += char(c);
}

bool CStdInStream::Eof()
{
  return (feof(_stream) != 0);
}

int CStdInStream::GetChar()
{
  int c = getc(_stream);
  if(c == EOF && !Eof())
    throw kReadErrorMessage;
  return c;
}